Mitsubishi Electric EHPT17X-VM6D Service Manual
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Mitsubishi Electric EHPT17X-VM6D Service Manual

Mitsubishi Electric EHPT17X-VM6D Service Manual

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Table of Contents

CYLINDER UNIT
SERVICE MANUAL
[Model Name]
EHPT17X-VM2D
EHPT17X-VM6D
EHPT17X-YM9D
EHPT20X-MED
EHPT20X-MHEDW
EHPT20X-TM9D
EHPT20X-VM6D
EHPT20X-YM9D
EHPT20X-YM9ED
EHPT30X-MED
EHPT30X-YM9ED
EHST17D-VM2D
EHST17D-YM9D
EHST20C-MED
EHST20C-TM9D
EHST20C-VM2D
EHST20C-VM6D
EHST20C-YM9D
EHST20C-YM9ED
[Service Ref.]
Refer to page 2.
CYLINDER UNIT
All manuals and user guides at all-guides.com
EHST20D-MED
EHST20D-TM9D
EHST20D-VM2D
EHST20D-VM6D
EHST20D-YM9D
EHST20D-YM9ED
EHST30C-MED
EHST30C-TM9ED
EHST30C-VM6ED
EHST30C-YM9ED
EHST30D-MED
EHST30D-TM9ED
EHST30D-VM6ED
EHST30D-YM9ED
ERPT17X-VM2D
ERPT20X-MD
ERPT20X-VM2D
ERPT20X-VM6D
ERPT30X-VM2ED
MAIN REMOTE
CONTROLLER
ERST17D-VM2BD
ERST17D-VM2D
ERST17D-VM6BD
ERST17D-VM6D
ERST17D-YM9BD
ERST20C-VM2D
ERST20C-VM6D
ERST20C-YM9D
ERST20D-VM2D
ERST20D-VM6D
ERST20D-YM9D
ERST30C-VM2ED
ERST30C-VM6ED
ERST30C-YM9ED
ERST30D-VM2ED
ERST30D-VM6ED
ERST30D-YM9ED
CONTENTS
TECHNICAL CHANGES ······························· 3
1. REFERENCE MANUAL ···························· 4
2. SAFETY PRECAUTION ··························· 5
3. SPECIFICATIONS ···································· 7
4. PART NAMES AND FUNCTIONS ·········· 11
5. OUTLINES AND DIMENSIONS ·············· 14
6. WIRING DIAGRAM ································· 16
7. FIELD WIRING ········································ 25
8. WATER SYSTEM DIAGRAM ·················· 29
9. CONTROLS ············································ 33
10. TROUBLESHOOTING ···························· 54
11. DISASSEMBLY PROCEDURE ··············· 72
13. SERVICE AND MAINTENANCE ············ 97
PARTS CATALOG (OCB714)
March 2022
No. OCH714
REVISED EDITION-E
Revision:
Connectable outdoor
units have been added in
REVISED-EDITION-E.
OCH714D is void.
Note:
This manual describes ser-
vice data of cylinder unit
only.

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Summary of Contents for Mitsubishi Electric EHPT17X-VM6D

  • Page 1: Table Of Contents

    All manuals and user guides at all-guides.com CYLINDER UNIT March 2022 No. OCH714 SERVICE MANUAL REVISED EDITION-E [Model Name] EHPT17X-VM2D EHST20D-MED ERST17D-VM2BD Revision: EHPT17X-VM6D EHST20D-TM9D ERST17D-VM2D Connectable outdoor units have been added in EHPT17X-YM9D EHST20D-VM2D ERST17D-VM6BD REVISED-EDITION-E. EHPT20X-MED EHST20D-VM6D ERST17D-VM6D OCH714D is void.
  • Page 2 All manuals and user guides at all-guides.com [Service Ref.] EHST20D-VM2DR1.UK ERST20C-VM6DR1.UK EHPT17X-VM2D.UK ERST20C-YM9DR1.UK EHST20D-VM6D.UK EHPT17X-VM2DR1.UK ERST20D-VM2D.UK EHST20D-VM6DR1.UK EHPT17X-VM6D.UK ERST20D-VM2DR1.UK EHST20D-YM9D.UK EHPT17X-VM6DR1.UK ERST20D-VM6DR1.UK EHST20D-YM9DR1.UK EHPT17X-YM9D.UK ERST20D-YM9DR1.UK EHST20D-YM9ED.UK EHPT17X-YM9DR1.UK ERST30C-VM2ED.UK EHST20D-YM9EDR1.UK EHPT20X-MED.UK EHST30C-MED.UK ERST30C-VM2EDR1.UK EHPT20X-MEDR1.UK EHST30C-MEDR1.UK ERST30C-VM6EDR1.UK EHPT20X-MHEDW.UK EHST30C-TM9ED.UK ERST30C-YM9EDR1.UK EHPT20X-MHEDWR1.UK EHST30C-TM9EDR1.UK ERST30D-VM2ED.UK...

  • Page 3: Technical Changes

    EHST20C-YM9D.UK EHST20C-YM9EDR1.UK EHST20C-YM9ED.UK EHST20C-TM9DR1.UK EHST20C-TM9D.UK ERST20C-VM2DR1.UK ERST20C-VM2D.UK EHST30C-MEDR1.UK EHST30C-MED.UK EHST30C-VM6EDR1.UK EHST30C-VM6ED.UK EHST30C-YM9EDR1.UK EHST30C-YM9ED.UK EHST30C-TM9EDR1.UK EHST30C-TM9ED.UK ERST30C-VM2EDR1.UK ERST30C-VM2ED.UK EHPT17X-VM2DR1.UK EHPT17X-VM2D.UK EHPT17X-VM6DR1.UK EHPT17X-VM6D.UK EHPT17X-YM9DR1.UK EHPT17X-YM9D.UK ERPT17X-VM2DR1.UK ERPT17X-VM2D.UK EHPT20X-MEDR1.UK EHPT20X-MED.UK EHPT20X-VM6DR1.UK EHPT20X-VM6D.UK EHPT20X-YM9DR1.UK EHPT20X-YM9D.UK EHPT20X-YM9EDR1.UK EHPT20X-YM9ED.UK EHPT20X-TM9DR1.UK EHPT20X-TM9D.UK EHPT20X-MHEDWR1.UK EHPT20X-MHEDW.UK ERPT20X-MDR1.UK ERPT20X-MD.UK ERPT20X-VM2DR1.UK ERPT20X-VM2D.UK...

  • Page 4: Reference Manual

    All manuals and user guides at all-guides.com REFERENCE MANUAL OUTDOOR UNIT'S SERVICE MANUAL Service Ref. Service Manual No. SUZ-SWM40VA.TH OCH718 SUZ-SWM60VA.TH OCB718 SUZ-SWM80VA.TH PUHZ-FRP71VHA2 OCH665 PUHZ-FRP71VHA2R1 OCB665 PUHZ-SW120VHAR5(-BS).UK OCH533 PUHZ-SW120YHAR5(-BS).UK OCB533 OCH526 PUHZ-SHW140YHAR5(-BS).UK OCB526 PUHZ-SHW80VAA(-BS).UK PUHZ-SHW80YAA(-BS).UK PUHZ-SHW112VAA(-BS).UK PUHZ-SHW112YAA(-BS).UK PUHZ-SW75VAA(-BS).UK OCH651 PUHZ-SW75YAA(-BS).UK OCB651 PUHZ-SW75VAA-SC.UK...

  • Page 5: Safety Precaution

    Do not position furniture or electrical appliances below the outdoor unit or cylinder unit. The discharge pipework from the emergency devices of the cylinder unit should be installed according to local law. Only use accessories and replacement parts authorised by Mitsubishi Electric ask a qualified technician to fit the parts. Electrical All electrical work should be performed by a qualified technician according to local regulations and the instructions given in this manual.
  • Page 6 All manuals and user guides at all-guides.com CAUTION Use clean water that meets local quality standards on the primary circuit. The outdoor unit should be installed in an area with sufficient airflow according to the diagrams in the outdoor unit installation manual. The cylinder unit should be located inside to minimise heat loss.

  • Page 7: Specifications

    All manuals and user guides at all-guides.com SPECIFICATIONS OCH714E...
  • Page 8 All manuals and user guides at all-guides.com OCH714E...
  • Page 9 All manuals and user guides at all-guides.com OCH714E...
  • Page 10 All manuals and user guides at all-guides.com OCH714E...

  • Page 11: Part Names And Functions

    All manuals and user guides at all-guides.com PART NAMES AND FUNCTIONS <E**T***-*M**D> (Packaged model system) (Split model system) (Split model 2 zone system) Note: For installation of all E**T***-*M*ED* models, make sure to install a suitably sized primary-side expansion vessel. (See figure 8.1 - 8.5 and 10.6.1 for further guidance) <Figure 4.1>...
  • Page 12 All manuals and user guides at all-guides.com EHST17/20D- EHST20/30D- EHST20/30D- EHST20C- EHST20/30C- EHST20/30C- ERST17/20D- ERST17D- ERST30D- Part name *M*D *M*ED *M*D *M*ED *M*D *M*BD *M*ED A DHW outlet pipe B Cold water inlet pipe C Water pipe (Space heating/cooling return connection) D Water pipe (Space heating/cooling flow connection) E Water pipe (Flow from heat pump connection) —...
  • Page 13 All manuals and user guides at all-guides.com ERST20C- ERST30C- EHPT17/20X- EHPT20/30X- EHPT20/30X- ERPT17/20X- ERPT20X- ERPT30X- EHPT20X- Part name *M*D *M*ED *M*D *M*ED *M*D VM*ED MHEDW DHW outlet pipe Cold water inlet pipe Water pipe (Space heating/cooling return connection) Water pipe (Space heating/cooling flow connection) Water pipe (Flow from heat pump connection) —...

  • Page 14: Outlines And Dimensions

    All manuals and user guides at all-guides.com OUTLINES AND DIMENSIONS 5-1. Technical Drawings <E**T***-*M**D> <Unit: mm> (Packaged model system) 67.8 DHW tank <E*PT30X-*M*ED> <EHPT20X-MHEDW> 170L 200L 300L 442.3 capacity 515.7 542.3 1400 1600 2050 PRESSURE TEMPERATURE & RELIEF VALVE HANDLE PRESSURE (SANITARY CIRCUIT) AIR VENT...
  • Page 15 All manuals and user guides at all-guides.com (Split model 2 zone system) DHW FLOW (G3/4) COLD WATER INLET (G3/4) REFRIGERANT(GAS) REFRIGERANT(LIQUID) 67.9 FLOW ZONE 1 (G1) FLOW ZONE 2 (G1) 334.9 414.9 470.7 510.7 ELECTRICAL CABLE INLETS RETURN ZONE 1(G1) RETURN ZONE 2(G1) PRESSURE RELIEF VALVE PRESSURE RELIEF VALVE...

  • Page 16: Wiring Diagram

    All manuals and user guides at all-guides.com WIRING DIAGRAM 6-1. E**T***-VM2(E)D 3-way valve (AC motor) (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) Table 6.9.1 3-way valve (Stepping motor) (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714E...
  • Page 17 All manuals and user guides at all-guides.com 6-2. E**T***-VM6(E)D 3-way valve (AC motor) (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) 3-way valve (Stepping motor) Table 6.9.1 (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714E...
  • Page 18 All manuals and user guides at all-guides.com 6-3. E**T***-YM9(E)D 3-way valve (AC motor) Table 6.9.1 (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) 3-way valve (Stepping motor) Table 6.9.1 (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714E...
  • Page 19 All manuals and user guides at all-guides.com 6-4. E**T***-M(E)D Table 6.9.1 3-way valve (AC motor) Table 6.9.1 (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) 3-way valve (Stepping motor) Table 6.9.1 (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 6.9.1 OCH714E...
  • Page 20 All manuals and user guides at all-guides.com 6-5. EH*T***-TM9(E)D 3-way valve (AC motor) (E*PT20/30X-*M**D*, E*ST**C/30D-*M**D) Table 6.9.1 3-way valve (Stepping motor) (E*PT17X-*M**D*, E*ST17/20D-*M**D) Table 6.9.1 Table 6.9.1 Table 6.9.1 Table 6.9.1 6.9.1 OCH714E...
  • Page 21 All manuals and user guides at all-guides.com 6-6. ERST17D-VM2BD Indoor unit powered Indoor unit powered CNPWM CN01 by independent source via outdoor unit (WH) (BK) Power supply <How to use TBO.1 to 4> To outdoor To outdoor Power supply to Booster heater Connect them using either way as shown below.
  • Page 22 All manuals and user guides at all-guides.com 6-7. ERST17D-VM6BD Indoor unit powered Indoor unit powered CNPWM CN01 by independent source via outdoor unit (WH) (BK) <How to use TBO.1 to 4> Power supply To outdoor Power supply To outdoor Connect them using either way as shown below. unit ~/N 230V 50Hz unit...
  • Page 23 All manuals and user guides at all-guides.com 6-8. ERST17D-YM9BD Indoor unit powered Indoor unit powered CNPWM CN01 by independent source via outdoor unit (WH) (BK) Power supply <How to use TBO.1 to 4> to Booster heater To outdoor Power supply To outdoor Connect them using either way as shown below.
  • Page 24 All manuals and user guides at all-guides.com 6-9. DIP Switch Functions The DIP switch number is printed on the circuit board next to the relevant switches. The word ON is printed on the circuit board and on the DIP switch block itself. To move the switch you need to use a pin or the corner of a thin metal ruler or similar.

  • Page 25: Field Wiring

    All manuals and user guides at all-guides.com FIELD WIRING Breaker abbreviation Meaning ECB1 Earth leakage circuit breaker for booster heater ECB2 Earth leakage circuit breaker for immersion heater Terminal block 1 Option 1: Cylinder unit powered via outdoor unit (If you want to use independent source, go to the Mitsubishi website.) PXZ model is not available.
  • Page 26 All manuals and user guides at all-guides.com <3 phase> Affix label A that is included with the manuals near each wiring diagram for cylinder unit and outdoor units. Cylinder unit Outdoor unit To control board Wiring Earth circuit leakage Power supply breaker circuit 3N~ 400 V 50 Hz...
  • Page 27 All manuals and user guides at all-guides.com Option 2: Cylinder unit powered by independent source. If the cylinder unit and outdoor unit have separate power supplies, the following Initial settings requirements MUST be carried out: White (Power supplied by CN01 outdoor unit) •...
  • Page 28 All manuals and user guides at all-guides.com <3 phase> Affix label B that is included with the manuals near each wiring diagram for cylinder unit and outdoor units. Cylinder unit Wiring Earth circuit leakage breaker circuit To control Power supply breaker board Isolating...

  • Page 29: Water System Diagram

    All manuals and user guides at all-guides.com WATER SYSTEM DIAGRAM *a. Refer to the following section [Local system]. <E*PT17X-*M*D> (Packaged model system) *b. If the outdoor unit is higher than the indoor Water flow unit, or if there is a location where air gets trapped in the upper part of the water pipe, consider adding this part.
  • Page 30 All manuals and user guides at all-guides.com Go to the Mitsubishi website to check the compo- <E*PT20/30X-*M**D> (Packaged model system) Water flow nent parts of each unit. *a. Refer to the following section [Local system]. Cold water *b. If the outdoor unit is higher than the indoor unit, or if there is a location where air gets trapped in the upper part of the water pipe, consider adding this part.
  • Page 31 All manuals and user guides at all-guides.com Local system 1-zone temperature control Zone1 Zone1 2-zone temperature control 1-zone temperature control with boiler Zone1 Zone1 Zone2 2-zone temperature control & Buffer tank control 1-zone temperature control (2-zone valve ON/OFF control) Zone1 Zone1 Zone2 Zone2...
  • Page 32 All manuals and user guides at all-guides.com Filling the cylinder unit (Primary circuit) 1. Check and charge expansion vessel. 2. Check all connections including factory fitted ones are tight. 3. Insulate pipework between cylinder unit and outdoor unit. 4. Thoroughly clean and flush system of all debris. (Refer to 4.2 in the installation manual.) 5.

  • Page 33: Controls

    The following is a guide to viewing the main settings. Should you require more modifications. Back Return to previous menu. information please contact your installer or local Mitsubishi Electric dealer. Confirm Used to select or save. (Enter key) Cooling mode is available for ERS series only. However, Cooling mode is not Power/Holiday If system is switched off pressing once will turn available when the indoor unit is connected to PUHZ-FRP.
  • Page 34 All manuals and user guides at all-guides.com 9-2. Setting the Main remote controller After the power has been connected to the outdoor and cylinder units (See "7. FIELD WIRING"), the initial system settings can be entered via the main remote control- ler.
  • Page 35 All manuals and user guides at all-guides.com <Main Remote Controller Menu Tree> Initial Unrestricted access Installer only Main screen * Short press for 1 Zone system. Long press Information Option Forced DHW ON ( )/OFF ON ( )/Prohibited ( )/Timer ( ) Heating/Cooling ON ( )/Prohibited ( )/Timer ( ) Energy monitor...
  • Page 36 All manuals and user guides at all-guides.com <Continued from the previous page.> <Main Controller Menu Tree> Unrestricted access Initial Installer only Main screen Main Long press menu Manual operation Menu Function settings Service Thermistor adjustment Password ON/OFF protected Economy settings for pump Delay ON/OFF Electric heater (Heating)
  • Page 37 All manuals and user guides at all-guides.com <Continued from the previous page.> <Main Controller Menu Tree> Unrestricted access Initial Installer only Main screen Main menu Long press Menu Booster heater 1 capacity Electric heater Booster heater 2 capacity capacity Immersion heater Analog output Pump 1 Water pump input...
  • Page 38 All manuals and user guides at all-guides.com 9-5. Service Menu The service menu provides functions for use by installer or service engineer. It is NOT intended the home owner alters settings within this menu. It is for this reason password protection is required to prevent unauthorised access to the service settings. The factory default password is "0000".
  • Page 39 All manuals and user guides at all-guides.com <Thermistor adjustment> This function allows adjustments to be made to the thermistor readings from −10 to 10°C in 0.5°C intervals. THW1: Thermistor (Flow water temp.) THW2: Thermistor (Return water temp.) THW5: Thermistor (DHW tank water temp.) THW6: Thermistor (Zone1 flow temp.)(Option) THW7: Thermistor (Zone1 return temp.)(Option) THW8: Thermistor (Zone2 flow temp.)(Option)
  • Page 40 All manuals and user guides at all-guides.com Mixing valve control 1. From the Auxiliary settings menu highlight Mixing valve control. 2. Press CONFIRM. 3. The Mixing valve control screen is displayed. 4. Use F1 and F2 buttons to set Running time between 10 to 240 seconds. The Running time equals to a period from full open of the valve (at a hot water mixing ratio of 100%) to full close (at a cold water mixing ratio of 100%).
  • Page 41 All manuals and user guides at all-guides.com <Operation settings> Heating operation This function allows operational setting of flow temperature range from the Ecodan and also the time interval at which the FTC collects and processes data for the auto adaptation mode. Menu subtitle Function Range...
  • Page 42 2 kW 0 kW 0 kW EHPT17X-VM2D 2 kW 0 kW 0 kW EHST20D-VM6D 2 kW 4 kW 0 kW EHPT17X-VM6D 2 kW 4 kW 0 kW EHST20D-YM9D 3 kW 6 kW 0 kW EHPT17X-YM9D 3 kW 6 kW 0 kW...
  • Page 43 All manuals and user guides at all-guides.com 2. Settings using the main remote controller In this menu, all parameters required to record the consumed electrical energy and the delivered heat energy which is displayed on the main remote controller can be set. The parameters are an electric heater capacity, supply power of water pump and heat meter pulse.
  • Page 44 All manuals and user guides at all-guides.com <Summary of settings> This function shows the current installer/user entered settings. Abbreviation Explanation Abbreviation Explanation HWtemp DHW max. temperature Z2 mode Operation mode HWdrop DHW temperature drop - HER (Heating room temperature) HWtime DHW max.
  • Page 45 All manuals and user guides at all-guides.com Resetting the password If you forget the password you entered, or have to service a unit somebody else installed, you can reset the password to the factory default of 0000. 1. From the main settings menu scroll down the functions until Service Menu is highlighted.
  • Page 46 All manuals and user guides at all-guides.com <Table 9.5.3> Request Request content Range Unit code Error history 1 (latest) Displays error history. ("– –" is displays if no history is present.) Code Error history 2 (second to last) Displays error history. ("– –" is displays if no history is present.) —...
  • Page 47 All manuals and user guides at all-guides.com Indoor unit switch setting display (Request code: 162 to 166) 0: OFF 1: ON 0: OFF 1: ON SW1, SW2, SW3, SW4, SW5 SW1, SW2, SW3, SW4, SW5 Display Display 00 00 00 40 00 01 00 41 00 02...
  • Page 48 All manuals and user guides at all-guides.com Indoor unit switch setting display (Request code: 162 to 166) 0: OFF 1: ON 0: OFF 1: ON SW1, SW2, SW3, SW4, SW5 SW1, SW2, SW3, SW4, SW5 Display Display 00 80 00 C0 00 81 00 C1 00 82...
  • Page 49 All manuals and user guides at all-guides.com Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following. 0: OFF 1: ON 0: OFF 1: ON Display Display xx 40 xx 00 xx 01 xx 41 xx 02...
  • Page 50 All manuals and user guides at all-guides.com Output signal display (Request code: 175/553) Please refer to Table 2 on relevant wiring diagram whilst using the following. 0: OFF 1: ON 0: OFF 1: ON Display Display xx C0 xx 80 xx C1 xx 81 xx C2...
  • Page 51 All manuals and user guides at all-guides.com 0: OFF 1: ON Output signal display (Request code: 175/553) Display Please refer to Table 2 on relevant wiring diagram whilst using the following. 40 xx 41 xx 0: OFF 1: ON 42 xx 43 xx Display 44 xx...
  • Page 52 All manuals and user guides at all-guides.com Input signal display (Request code: 176/554) Please refer to Table 1 on relevant wiring diagram whilst using the following. 0: OFF (open) 1: ON (short) 0: OFF (open) 1: ON (short) Display Display 00 00 00 40 00 01...
  • Page 53 All manuals and user guides at all-guides.com Indoor unit only operation Indoor unit only operation In indoor unit only operation, an operation without connecting outdoor unit is possible. Indoor unit When in Indoor unit only operation, the main control has control functions. Necessary Heat pump Not necessary...

  • Page 54: Troubleshooting

    All manuals and user guides at all-guides.com TROUBLESHOOTING 10-1. Troubleshooting <Summary of self-diagnosis based on Check codes and Service Procedures> Present and past Check codes are logged, and they can be displayed on the main remote controller or control board of the outdoor unit. Please refer to the table below and subsequent explanations to diagnose and remedy typical problems that may occur in the field.
  • Page 55 All manuals and user guides at all-guides.com 10-4. Self-diagnosis and action Check if DIP SW is set correctly. (Refer to "6-9. DIP switch functions".) Check code Title and display conditions Possible Cause Diagnosis and action Circulation water temperature overheat 1. Insufficient system head 1 Refer to table in "10-6.
  • Page 56 All manuals and user guides at all-guides.com Check code Title and display conditions Possible Cause Diagnosis and action P1/P2/L5/LD Indoor unit temperature thermistor failure 1. Connector/terminal wire has become 1. Visually check the terminals and connec- Note: The thermistors subject to failure can be detached or loose wiring.
  • Page 57 All manuals and user guides at all-guides.com Check code Title and display conditions Possible Cause Diagnosis and action Heating operation error 1. THW1 has become detached from its 1. Visually inspect location and reattach as Note: “3” is displayed in “Request code: 567” in holder.
  • Page 58 All manuals and user guides at all-guides.com Check code Title and display conditions Possible Cause Diagnosis and action Low primary circuit (Zone2 side) flow rate 1. Insufficient system head 1. If more head required either add a pump of the same size or replace existing pump. detected by flow switch 2.
  • Page 59 All manuals and user guides at all-guides.com Check code Title and display conditions Possible Cause Diagnosis and action <Defrosting> <Defrosting> THW2 detects a temperature ≤15ºC and TH2 1. Reduced water flow 1., 2. Check water piping. detects a temperature ≤−16ºC for consecutive 10 •...
  • Page 60 All manuals and user guides at all-guides.com Check code Title and display conditions Possible Cause Diagnosis and action E1/E2 Main remote controller control board failure 1. Fault with the main remote controller 1. Replace main remote controller circuit Check code E1 displayed if main remote control- circuit board board.
  • Page 61 All manuals and user guides at all-guides.com 10-5. Troubleshooting by inferior phenomena Fault symptom Possible cause Explanation - Solution Main remote controller 1. There is no power supply to main remote 1. Check LED2 on FTC. (See "6. WIRING DIAGRAM".) display is blank.
  • Page 62 Contact your Mitsubishi Electric dealer. 7. Immersion heater cut-out tripped. 7. Check immersion heater thermostat and press reset button, located on im- mersion heater boss, if safe.
  • Page 63 Contact your Mitsubishi Electric dealer. 5. Immersion heater cut-out has been triggered. 5. Check immersion heater thermostat and press reset button located on immer- sion heater boss, if safe.
  • Page 64 All manuals and user guides at all-guides.com Fault symptom Possible cause Explanation - Solution Heating system does Heating system operates depending on the heating Normal operation, no action necessary. not reach the set load to prevent low-load heating system from the lower temperature.
  • Page 65 All manuals and user guides at all-guides.com Fault symptom Possible cause Explanation - Solution Water discharges from 1. If continual – field supplied pressure reducing 1. Check function of pressure reducing valve and replace if necessary. expansion relief valve valve not working. - part of Inlet Control 2.
  • Page 66 Annual Maintenance It is essential that the cylinder unit is serviced at least once a year by a qualified individual. Any spare parts required should be purchased from Mitsubishi Electric. NEVER bypass safety devices or operate the unit without them being fully operational.
  • Page 67 All manuals and user guides at all-guides.com 10-6. Checking Component Parts' Function Part Name Checkpoints Water circulation pump (primary circuit) BROWN PWM input signal Signal cable BLUE Signal ref. <Water circulation pump (primary circuit) characteristics> BLACK Feedback signal BROWN E*PT17X series BLUE Speed 5 (Default setting) Power cable...
  • Page 68 All manuals and user guides at all-guides.com Part Name Checkpoints Water circulation pump Measure the resistance between the terminals with a multimeter. (sanitary circuit) (Winding temperate 20°C) Terminal Normal (speed 2) Abnormal 211 Ω Open or Short DHW circulation pump MUST be set to speed 2. Immersion heater Measure the resistance between the terminals with a multimeter.
  • Page 69 All manuals and user guides at all-guides.com Part Name Checkpoints Earth leakage circuit breaker for heater If a short circuit occurs on the booster heater, immersion heater, or each power line, a short-circuit breaker will trip and power source will be blocked. Eliminate the causes of short circuit and then turn on the breaker again.
  • Page 70 All manuals and user guides at all-guides.com <Thermistor Characteristics Charts> • Room temperature thermistor (TH1) • Liquid refrigerant temperature thermistor (TH2) • Flow water temperature thermistor (THW1) • Return water temperature thermistor (THW2) • DHW tank temperature thermistor (THW5) • Zone1 flow water temperature thermistor (THW6) •...
  • Page 71 All manuals and user guides at all-guides.com 10-7. Test point diagram FTC (Controller board) CNP1/OUT1 (TBO.1 1-2) Water circulation pump1 (230 VAC) OUT2 (TBO.1 3-4) Water circulation pump2 (230 VAC) CN01 OUT3 (TBO.1 5-6) Power supply Water circulation pump3 (230 VAC) (230 VAC) CNP4 (OUT14) Water circulation pump4...

  • Page 72: Disassembly Procedure

    All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE <Preparation for the repair service> ● Prepare the proper tools. ● Prepare the proper protectors. ● Provide adequate ventilation. ● After stopping the operation of the cylinder and outdoor unit, turn off all the power-supply breaker. ●...
  • Page 73 All manuals and user guides at all-guides.com PHOTOS/FIGURES DISASSEMBLY PROCEDURE 3. How to remove the electrical parts Photo 3-1 Earth leakage circuit (Step (1) is applied to all the following parts.) Control box breaker (ECB1) Controller board (1) Remove the front panel. (Refer to Procedure 1.) <Earth leakage circuit breaker>...
  • Page 74 All manuals and user guides at all-guides.com PHOTOS/FIGURES DISASSEMBLY PROCEDURE Photo 4-1 4. How to remove the control box (1) Remove the front panel. (Refer to Procedure 1.) Screw Bracket (L) Cable clamp Bracket (R) (2) Disconnect only the lead wires in the control box that Screw connect to the components in the cylinder unit.
  • Page 75 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES 5. How to remove water pump (primary circuit)/pump valve/ Photo 5-1 strainer valve <Water pump> Strainer Quick connection Close the pump valve (OFF) before removing the water pump, valve O-ring and open the valves (ON) after reinstalling the water pump.
  • Page 76 All manuals and user guides at all-guides.com From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 5-5 Cover Strainer mesh (inside) <Strainer valve> (6) Remove the 2 screws on the strainer valve stay. (Photo 5-1) (7) Remove the strainer valve by detaching the quick con- nection.
  • Page 77 Model Lead wire No. Contactor ERST17D-VM6D ERST20C-VM6D No.1 BHC1-U EHST20D-VM6D ERST30C-VM6ED No.2 BHC1-V Photo 8-1 ERST20D-VM6D EHPT17X-VM6D No.4 BHC2-U EHST30D-VM6ED EHPT20X-VM6D ERST30D-VM6ED ERPT20X-VM6D Controller board Control box No.5 BHC2-V EHST20C-VM6D ERPT30X-VM6ED EHST30C-VM6ED ERST17D-VM6BD...
  • Page 78 All manuals and user guides at all-guides.com From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 8-3 (3) Remove the DIV frame by removing the 2 screws on it. Booster heater O-ring (Photo 8-2) (Only E**T20/30* series) Remove the DIV frame by cutting the band and removing the 4 screws on it.
  • Page 79 All manuals and user guides at all-guides.com From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 8-4 (9) Remove the 2 screws that hold the heater stay onto the front frame (L). Lift the booster heater slightly and remove the booster heater with the heater stay from the front frame (L).
  • Page 80 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES 10. How to remove the plate heat exchanger (P-HEX) Photo 10-1 DIV frame (Refrigerant - Water) <E*ST**C/D series> (1) Pump down the refrigerant circuit and close the stop valve at the outdoor unit side. Cable strap (Refer to 12.
  • Page 81 All manuals and user guides at all-guides.com From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES 10. How to remove the plate heat exchanger (P-HEX) Photo 10-4 (Refrigerant - Water) Expansion vessel (7) Remove the thermistor (TH2) from the thermistor holder. (Refer to Procedure 21.) (8) Remove the manometer with the manometer cover.
  • Page 82 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 12-1 12. How to remove the pressure relief valve/manometer/air vent (automatic) Manometer (1) Remove the front panel. (Refer to Procedure 1.) Manometer connection (G1/4") Manometer stay (2) Swing the control box to the front. (Refer to Procedure 4.) <Manometer>...
  • Page 83 All manuals and user guides at all-guides.com From the previous page. DISASSEMBLY PROCEDURE PHOTOS/FIGURES 12. How to remove the pressure relief valve/manometer/air Photo 12-4 Air vent vent (automatic) (automatic) Pressure relief valve (3 bar) <Pressure relief valve (3 bar)> (3) Remove the field piping from the pressure relief valve (3 bar).
  • Page 84 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 13-1 13. How to remove the expansion vessel (1) Remove the front panel. (Refer to Procedure 1.) Expansion vessel Flare joint Flare nut (2) Swing the control box to the front. (Refer to Procedure 4.) (3) Remove 2 tapes.
  • Page 85 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES 16. How to remove the drain cock (primary circuit) Photo 16-1 (1) Remove the front panel. (Refer to Procedure 1.) <Pump valve side> (2) Remove the drain cock from the pump valve by turning the drain cock.
  • Page 86 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 18-1 18. How to remove the plate heat exchanger (P-HEX) <Water - Water> Gasket (G3/4") Nut (G3/4") (1) Remove the front panel. (Refer to Procedure 1.) (2) Drain water in the P-HEX (Water-Water) using the drain cock (Primary circuit) and the drain cock (Sanitary circuit).
  • Page 87 All manuals and user guides at all-guides.com PHOTOS/FIGURES DISASSEMBLY PROCEDURE 20. How to remove the scale trap (sanitary circuit) Photo 20-1 (1) Remove the front panel. (Refer to Procedure 1.) (2) Disconnect the CNP4 connector and the earth cable in the control box.
  • Page 88 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES 21. How to remove the liquid refrigerant temp. thermistor Photo 21-1 (TH2) /flow water temp. & return water temp. thermis- Thermistor Thermistor <THW5A> tors (THW1,THW2) /tank water temp. thermistor (THW5) <THW5B>...
  • Page 89 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 22-1 22. How to remove the side panels (1) Remove the front panel. (Refer to Procedure 1.) Side panel (Right) (2) Remove the 4 screws on the top panel, and remove the 2 screws that hold the top panel onto the back panel.
  • Page 90 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES Photo 24-1 24. How to remove the back panel (1) Remove the front panel. (Refer to Procedure 1.) (2) Remove the side panels. (Refer to Procedure 22.) (3) Remove the 4 screws on the back panel, and remove the Top panel Screws (Top panel) 2 screws that hold the back panel onto the frame.
  • Page 91 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES 25. How to detach and attach the quick connection Photo 25-1 Refer to the following steps when detaching and attaching the quick connection. (1) Remove the clip. (Photos 25-1 and 25-2) (2) Separate the connected parts to remove the O-ring.
  • Page 92 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES How to remove the multi function group (ERST17D- Photo 26 ***BD model) Same diameter Same diameter (1) Remove the front panel. (Refer to Procedure 1.) Multi function group quick connection quick connection (2) Remove the DIV frame by cutting the band and removing the 4 screws on it.(Photo 10-6)
  • Page 93 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES How to remove the mixing valve (ERST17D-***BD Photo 28-1 model) Mixing valve motor (1) Remove the front panel. (Refer to Procedure 1.) the relay connector (2) Disconnect (Mixing valve) under the control box.
  • Page 94 All manuals and user guides at all-guides.com DISASSEMBLY PROCEDURE PHOTOS/FIGURES 30. How to remove the zone1 flow water temp. & zone1 return Photo 30 water temp. thermistors (THW6, THW7) /zone2 flow water Thermistor <THW9> temp. & zone2 return water temp. thermistors (THW8, Band Thermistor <THW6>...
  • Page 95 All manuals and user guides at all-guides.com Notes on replacing the parts Replacement of the parts listed below requires the following procedure. After the parts are removed, eliminate loctite on threads by applying loctite remover, apply new loctite, and then install and tighten the parts to the specified tightening torques below.

  • Page 96: Supplementary Information

    All manuals and user guides at all-guides.com SUPPLEMENTARY INFORMATION Refrigerant collecting (pumpdown) for split model systems only Refer to “Refrigerant collection” in the outdoor unit installation manual or service manual. Back-up operation of boiler Heating operation is backed up by boiler. For more details, refer to the installation manual of PAC-TH012HT(L)-E.

  • Page 97: Service And Maintenance

    All manuals and user guides at all-guides.com SERVICE AND MAINTENANCE Engineers Forms Should settings be changed from default, please enter and record new setting in ‘Field Setting’ column. This will ease resetting in the future should the system use change or the circuit board need to be replaced. Commissioning/Field settings record sheet Main remote controller screen Parameters...
  • Page 98 All manuals and user guides at all-guides.com Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters Notes setting setting Setting Service Pump speed Pump speed (1 to 5) Heating/Cooling Pump speed (1 to 5) menu Heat source setting Standard/Heater/Boiler/Hybrid *11...
  • Page 99 All manuals and user guides at all-guides.com Commissioning/Field settings record sheet (continued from the previous page) Default Field Main remote controller screen Parameters setting Notes setting Service Energy Electric heater Booster heater 1 0 to 30 kW 2 kW monitor menu capacity capacity...
  • Page 100 All manuals and user guides at all-guides.com Annual Maintenance Log Book Contractor name Engineer name Site name Site number Cylinder unit maintenance record sheet Warranty number Model number Serial number Mechanical Frequency Notes Turn OFF water supply, drain DHW tank, remove mesh from strainer clean and replace in strainer.
  • Page 101 All manuals and user guides at all-guides.com <Draining particles from the magnetic filter> WARNING: DRAINED WATER MAY BE VERY HOT 1. Turn OFF the unit via the user interface. 2. Turn OFF the circuit breaker. 3. Check if body of the magnet filter is still screwed tight (a). 4.
  • Page 102 All manuals and user guides at all-guides.com HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2019 MITSUBISHI ELECTRIC CORPORATION Issued: Mar. 2022 No. OCH714 REVISED EDITION-E Issued: Nov. 2021 No. OCH714 REVISED EDITION-D Issued: Jun. 2021 No. OCH714 REVISED EDITION-C Issued: Oct.

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